this post was submitted on 05 Jan 2024
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If you use HTTPS with a publicly-trusted certificate (such as via Let's Encrypt), the host names in the certificate will be published in certificate transparency logs. So at least the "main" domain will be known, as well as any subdomains you don't hide by using wildcards.
I'm not sure whether anyone uses those as a list of sites to automatically visit, but I certainly would not count on nobody doing so.
That just gives them the domain name though, so URLS with long randomly-generated paths should still be safe.
There is also the DNS system itself, not sure if reverse lookup is possible in some way without a PTR record, but suffice to say there are ways, and there are many.
Obscurity is not security, just a reasonable first line of defense. If you run something publicly accessible, lock it down.
Stuff that can't be brute forced in a million years is a good way to do that, even if it's just a string in a URL. It's basically like having to enter a password. You could even fail2ban it by banning IPs that try a bunch of random URLs that aren't valid, or use a simple rate-limit.